I know they're 'only' boots, but after trying out about 5 pairs, I finally found the Salomon Launch Boa boots (size 10 when I'm usually a 9.5) are the right fit for
Snowboard Boots Salomon Perpetual Men's 9.5 Memory Fit Lace Up Grey Black Red | eBay
Salomon LINEA Snowboard Boots Womens Size 8 USA White FE91 | eBay